Archive image from page 378 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 F. Børgesen: Rhodophyceæ of the Danish W. Indies. 371 irregularly branched, some of the branches being very regularly pinnate or bipinnate, others bearing a few scattered pinnules or being quite barren. Regarding the anatomical structure we find in the apex of the plant an apical cell usually rather broad with convex sides, sometimes also more conical (Fig. 362 d, e). At the base of this, watch-glass-shaped segments are cut off. From these segments Fig. 362. Gelidio
Archive image from page 378 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 F. Børgesen: Rhodophyceæ of the Danish W. Indies. 371 irregularly branched, some of the branches being very regularly pinnate or bipinnate, others bearing a few scattered pinnules or being quite barren. Regarding the anatomical structure we find in the apex of the plant an apical cell usually rather broad with convex sides, sometimes also more conical (Fig. 362 d, e). At the base of this, watch-glass-shaped segments are cut off. From these segments Fig. 362. Gelidiopsis rigida (Vahl) Weber-van Bosse. a, summit of young thallus covered with hairs (about 50:1); b, longitudinal section of medullary cells (about 200:1); c, d, apices of two filaments show- ing the apical cell (about 500:1); e, transverse section of the thallus (about 70:1). short filaments originate, diverging in all directions and these filaments are again gradually, by various divisions, transformed into a medullary tissue composed of thick-walled cells all of nearly the same size and an epidermal layer of densely placed small cells (Fig. 362 e). From a longitudinal section it appears that the cells of the medullary tissue are subcylindrical, about six times as long as broad with more or less obhque walls (Fig. 362 b). When referring this plant to the genus Gelidiopsis M''® Weber was of the opinion that it had no apical cell, Okamura (1. c, fig. 6) being the first who observed it. Later on in the paper on 'The Rhodophyceæ of the Percy Sladen Trust Expedition' (Transact. Linn. Soc, London 1914, vol. XVI, Zoology, p. 280) M«'« Weber has corrected this mistake. In the above mentioned paper of Oka- mura good figures of this plant are found. 24
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